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About Ilias Tsagklis

Ilias Tsagklis
Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

Arrow sketch on JFrame example

package com.javacodegeeks.snippets.desktop;

import java.awt.Container;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class KeyFrame extends JPanel implements KeyListener {

    private Point start = new Point(0, 0);
    private Point end = new Point(0, 0);

    public static void main(String[] args) {

  JFrame jFrame = new JFrame();


  jFrame.setSize(300, 300);

  jFrame.addWindowListener(new WindowAdapter() {


public void windowClosing(WindowEvent e) {




  Container p = jFrame.getContentPane();

  p.add(new KeyFrame());


    public KeyFrame() {


    public void keyPressed(KeyEvent keyEvent) {

  int key = keyEvent.getKeyCode();

  int i;

  if (keyEvent.isShiftDown()) {

i = 5;

  } else {

i = 1;


  if (key == KeyEvent.VK_LEFT) {

add(-i, 0);

  } else if (key == KeyEvent.VK_RIGHT) {

add(i, 0);

  } else if (key == KeyEvent.VK_UP) {

add(0, -i);

  } else if (key == KeyEvent.VK_DOWN) {

add(0, i);


    public void keyReleased(KeyEvent evt) {

    public void keyTyped(KeyEvent evt) {

    public boolean isFocusTraversable() {

  return true;

    public void add(int x, int y) {

  end.x += x;

  end.y += y;

  Graphics graphics = getGraphics();

  graphics.drawLine(start.x, start.y, end.x, end.y);


  start.x = end.x;

  start.y = end.y;
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